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Summary: Protected Ctors | Methods | Inherited Methods

# SelectorProvider

`public abstract class SelectorProvider`
`extends Object` ``

java.lang.Object
↳ | java.nio.channels.spi.SelectorProvider

Service-provider class for selectors and selectable channels.

A selector provider is a concrete subclass of this class that has a zero-argument constructor and implements the abstract methods specified below. A given invocation of the Java virtual machine maintains a single system-wide default provider instance, which is returned by the `provider` method. The first invocation of that method will locate the default provider as specified below.

The system-wide default provider is used by the static `open` methods of the `DatagramChannel`, `Pipe`, `Selector`, `ServerSocketChannel`, and `SocketChannel` classes. It is also used by the `System.inheritedChannel()` method. A program may make use of a provider other than the default provider by instantiating that provider and then directly invoking the `open` methods defined in this class.

All of the methods in this class are safe for use by multiple concurrent threads.

## Summary

### Protected constructors
`SelectorProvider()` Initializes a new instance of this class.

### Public methods
`Channel` | `inheritedChannel()` Returns the channel inherited from the entity that created this Java virtual machine.
`abstract DatagramChannel` | `openDatagramChannel(ProtocolFamily family)` Opens a datagram channel.
`abstract DatagramChannel` | `openDatagramChannel()` Opens a datagram channel.
`abstract Pipe` | `openPipe()` Opens a pipe.
`abstract AbstractSelector` | `openSelector()` Opens a selector.
`abstract ServerSocketChannel` | `openServerSocketChannel()` Opens a server-socket channel.
`abstract SocketChannel` | `openSocketChannel()` Opens a socket channel.
`static SelectorProvider` | `provider()` Returns the system-wide default selector provider for this invocation of the Java virtual machine.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Protected constructors

### SelectorProvider

    protected SelectorProvider ()

Initializes a new instance of this class.

Throws
`SecurityException` | If a security manager has been installed and it denies `RuntimePermission``("selectorProvider")`

## Public methods

### inheritedChannel

    public Channel inheritedChannel ()

Returns the channel inherited from the entity that created this Java virtual machine.

On many operating systems a process, such as a Java virtual machine, can be started in a manner that allows the process to inherit a channel from the entity that created the process. The manner in which this is done is system dependent, as are the possible entities to which the channel may be connected. For example, on UNIX systems, the Internet services daemon (inetd) is used to start programs to service requests when a request arrives on an associated network port. In this example, the process that is started, inherits a channel representing a network socket.

In cases where the inherited channel represents a network socket then the `Channel` type returned by this method is determined as follows:

- If the inherited channel represents a stream-oriented connected socket then a `SocketChannel` is returned. The socket channel is, at least initially, in blocking mode, bound to a socket address, and connected to a peer.

- If the inherited channel represents a stream-oriented listening socket then a `ServerSocketChannel` is returned. The server-socket channel is, at least initially, in blocking mode, and bound to a socket address.

- If the inherited channel is a datagram-oriented socket then a `DatagramChannel` is returned. The datagram channel is, at least initially, in blocking mode, and bound to a socket address.

In addition to the network-oriented channels described, this method may return other kinds of channels in the future.

The first invocation of this method creates the channel that is returned. Subsequent invocations of this method return the same channel.

Returns
`Channel` | The inherited channel, if any, otherwise `null`.

Throws
`IOException` | If an I/O error occurs
`SecurityException` | If a security manager has been installed and it denies `RuntimePermission``("inheritedChannel")`

### openDatagramChannel

    public abstract DatagramChannel openDatagramChannel (ProtocolFamily family)

Opens a datagram channel.

Parameters
`family` | `ProtocolFamily`: The protocol family

Returns
`DatagramChannel` | A new datagram channel

Throws
`UnsupportedOperationException` | If the specified protocol family is not supported
`IOException` | If an I/O error occurs

### openDatagramChannel

    public abstract DatagramChannel openDatagramChannel ()

Opens a datagram channel.

Returns
`DatagramChannel` | The new channel

Throws
`IOException` | If an I/O error occurs

### openPipe

    public abstract Pipe openPipe ()

Opens a pipe.

Returns
`Pipe` | The new pipe

Throws
`IOException` | If an I/O error occurs

### openSelector

    public abstract AbstractSelector openSelector ()

Opens a selector.

Returns
`AbstractSelector` | The new selector

Throws
`IOException` | If an I/O error occurs

### openServerSocketChannel

    public abstract ServerSocketChannel openServerSocketChannel ()

Opens a server-socket channel.

Returns
`ServerSocketChannel` | The new channel

Throws
`IOException` | If an I/O error occurs

### openSocketChannel

    public abstract SocketChannel openSocketChannel ()

Opens a socket channel.

Returns
`SocketChannel` | The new channel

Throws
`IOException` | If an I/O error occurs

### provider

    public static SelectorProvider provider ()

Returns the system-wide default selector provider for this invocation of the Java virtual machine.

The first invocation of this method locates the default provider object as follows:

1. If the system property `java.nio.channels.spi.SelectorProvider` is defined then it is taken to be the fully-qualified name of a concrete provider class. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.

2. If a provider class has been installed in a jar file that is visible to the system class loader, and that jar file contains a provider-configuration file named `java.nio.channels.spi.SelectorProvider` in the resource directory `META-INF/services`, then the first class name specified in that file is taken. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.

3. Finally, if no provider has been specified by any of the above means then the system-default provider class is instantiated and the result is returned.

Subsequent invocations of this method return the provider that was returned by the first invocation.

Returns
`SelectorProvider` | The system-wide default selector provider

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